<script>

    class Person {
        constructor() {
            this.name = 'laohu';
            this.age = 100;
        }

        speak() {
            console.log('我的名字叫',this.name)
        }
    }

    let p = new Person();

    let speak = p.speak.bind(p);
    p.speak();
    speak();



</script>